As far as the F goes in a vacuum, I think so yes. To comeback from 2-0 (something he hadn’t done since Wimby 07 vs Youzhny), at his worst schlem (an event he hadn’t won in 13 years), after foot surgery and having rona less than a month earlier at the age of 35.5 is just insane. For me it’s the most impressive comeback in men’s tennis.